How to disable browser's back using php?-PHP Problem-php.cn

How to disable browser's back using php?

coldplay.xixi

Release： 2023-03-03 13:38:01

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Use PHP to disable browser back-off: 1. Add [] tag to the header and securely connect [pragma: no-cache] to prevent the browser from caching the page; 2. Use program control , remove [no-store] in []

How to disable browser's back using php?

##Use php to disable the browser Ways to fall back:

The best solution is to use a mix of client-side scripts and server-side scripts.

The easiest way is to add the

tag in the header

<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache,no-store, must-revalidate"> 
<META HTTP-EQUIV="pragma" CONTENT="no-cache"> 
<META HTTP-EQUIV="expires" CONTENT="0">

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If you use the above method to force the browser to no longer cache the web page, The following points must be noted:

"pragma: no-cache" only prevents the browser from caching the page when using a secure connection. For unprotected pages, "pragma: no-cache" is treated the same as "expires: -1", in which case the browser still caches the page but marks the page as expired immediately.

In IE 4 or 5, the "cache-control" meta http-equiv tag will be ignored and has no effect. In practical applications we can add all these codes. However, since this method does not work in all browsers, it is not recommended. But if it is in an intranet environment and the administrator can control which browser the user uses, I think some people will still use this method.

In addition, you can also use program control

<?php 
header("Cache-control:no-cache,no-store,must-revalidate"); 
header("Pragma:no-cache"); 
header("Expires:0"); 
?>

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If in

orheader(“Cache-control:no-cache,no-store,must-revalidate”); is missing no-storeCan’t solve Firefox’s cache

This method is very effective! It forces the browser to revisit the server to download the page instead of reading the page from cache. When using this method, the programmer's main task is to create a session-level variable that determines whether the user can still view the page that is not suitable for access via the back button.

Since the browser no longer caches this page, the browser will re-download the page when the user clicks the back button. At this time, the program can check that session variable to see if the user should be allowed to open this page.

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